JP4070592B2 - Method of injecting water-stopping material for steel pipe joints - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for injecting a water-stopping material for a steel pipe joint portion, and more particularly to a method for injecting a water-stopping material for a joint portion of a steel pipe that is embedded in the ground in a substantially horizontal direction.
[0002]
[Prior art]
As a kind of auxiliary method when constructing a tunnel or underground structure, prior to tunnel excavation, a steel pipe is inserted and installed along the outer periphery of the excavation section to form a roof that matches the excavation section shape, and this roof is supported. A pipe roof construction method is known which is supported directly by construction and suppresses loosening and deformation of natural ground due to excavation.
[0003]
In such a pipe roof construction method, when water-stopping is required, a plurality of steel pipes are oriented in the horizontal direction through the joints provided at both ends while being connected in the horizontal direction. When the roof is formed by embedding, a high-viscosity water-stopping material such as mortar is injected into the joint portion to ensure water-stopping between the steel pipes.
[0004]
In this case, it is unclear whether it is disclosed in a patent document or a non-patent document, but the following method has been adopted in an actual construction site. The first method is to form a water-stopping material injection hole at a predetermined pitch in the joint, and after the steel pipe is buried, an operator enters the inside and fills the joint with the water-stopping material from the injection hole. It is a method of injection.
[0005]
The second method is a method of filling and injecting a water-stopping material from one end side of the joint part after embedding the steel pipe without taking any special means in the joint part or the like.
[0006]
However, such a conventional water-stopping material injection method for a steel pipe joint has a problem described below.
[0007]
[Problems to be solved by the invention]
That is, in the first method, the worker enters the inside of the steel pipe and injects the water-stopping material. However, when the diameter of the steel pipe is small, the work is performed in a narrow space and the work environment is deteriorated. was there.
[0008]
Further, in the second method, since the water-stopping material is injected at a time from one end side of the joint portion, it is very difficult and almost impossible to obtain complete water-stopping.
[0009]
The present invention has been made in view of such conventional problems, and the object of the present invention is to eliminate the work in a poor environment and obtain a substantially complete water stop. It is in providing the water-stopping material injection method of a part.
[0010]
[Means for Solving the Problems]
To achieve the above object, the present invention is, via a joint portion provided in the steel pipe, while connecting the steel pipes laterally buried directed to a substantially horizontal direction a plurality of the steel pipe in the ground In the method of injecting a water-stopping material for a steel pipe joint part, injecting a high-viscosity water-stopping material such as mortar into the joint part to ensure water-stopping between the steel pipes, the joint part is adjacent to the steel pipe. with one protrusion protruding from the outer surface of, provided on the other inner surface of the steel pipe adjacent the can axial direction of the insertion of the protrusion, impossible separation of the connecting direction after the insertion of the protrusion A pipe portion for injecting the high-viscosity water-stopping material on the side of the cylinder portion, and connecting the cylinder portion and the injection tube body along the longitudinal axis direction. with installing multiple communicating pipe which communicates with a predetermined spacing, into the body the injection tube, the fluid Note The diameter, the injection pipe of the high-viscous water blocking material having a pair of packer to shrink installed, across the communicating pipe, by expanded it in the state in which the pair of packer before and after The injection space partitioned by the packer is defined, and the high-viscosity waterstop material is filled and injected into the cylindrical portion through the injection space.
[0011]
According to the water-stopping material injection method of the steel pipe joint portion configured in this way, a pipe for injection of a highly viscous water-stopping material is attached to the side of the tube, and the tube and the tube for injection are A plurality of communication pipes that communicate with each other at a predetermined interval along the longitudinal axis direction are installed, and a water-stopping material injection pipe having a pair of packers whose diameter is expanded and contracted by fluid injection is provided in the injection pipe body. Installed, sandwiching each communication pipe, and expanding the diameter with a pair of packers arranged in front and back of the pipes, separating the injection space partitioned by the packers, and stopping in the cylinder part via the injection space Since the water material is filled and injected, it is not necessary for the worker to enter the inside of the steel pipe having a poor working environment to perform the injection work.
[0012]
In this case, the water stop material separates the injection space partitioned by the packer, and fills and injects the water stop material into the cylindrical portion through the injection space, so than when injecting the water stop material at a time, Fine injection can be performed, and construction management becomes easy.
[0013]
The high-viscosity water-stopping material can have the same installation interval between the communication pipes, and can inject a certain amount into the injection space according to the volume of the cylindrical portion.
[0014]
According to this configuration, when the injection amount of the water-stopping material is measured, the presence or absence of a cavity can be predicted from the measured value.
[0015]
A check valve that allows inflow of the water-stopping material from the injection space into the tube portion and prevents the water-stopping material filled in the tube portion from flowing out to the tube side in the communication pipe. Can be installed.
[0016]
The protrusion may be formed in a T shape.
The cylindrical portion may be formed in a square cross section, and a slit hole into which the protruding portion can be inserted can be formed along the longitudinal axis direction.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. 1 to 3 show an embodiment of a method for injecting a water-stopping material for a steel pipe joint according to the present invention.
[0018]
The injection method shown in these drawings illustrates the case where the present invention is applied when a tunnel T having a square cross section is constructed as shown in FIG. In the example shown in the figure, prior to tunnel excavation, a steel pipe 10 is inserted and installed along the outer circumference of the excavation cross section to form a roof that matches the excavation cross section shape, and this roof is directly supported by a support work. The case where it applies to the pipe roof construction method which suppresses the looseness and deformation of a natural ground accompanying excavation is illustrated.
[0019]
The steel pipe 10 is formed in a circular cross section, and a joint portion 12 is provided on an outer peripheral portion. The steel pipe 10 is sequentially connected in the lateral direction through the joint portion 12 and embedded in the ground. At this time, each steel pipe 10 is embedded in the ground so as to be oriented substantially in the horizontal direction, and a water-stopping material 14 for ensuring water-stopping between the steel pipes 10 is injected into each joint portion 12. .
[0020]
As the water stop material 14 used in this case, for example, a highly viscous substance such as a mortar having a predetermined composition is used. FIG. 2 shows details of the joint portion 12 of the steel pipe 10. In the case of the present embodiment, the steel pipe 10 is a cylindrical body having a substantially circular cross section, and the joint portion 12 is disposed on the outer peripheral portion of the cross section .
[0021]
The joint portion 12 includes a T-shaped protrusion 16 and a rectangular tube portion 18. The T-shaped protrusion 16 protrudes from the outer peripheral surface of one of the steel pipes 10 connected to each other, and has a length extending over the entire length of the steel pipe 10.
[0022]
Cylindrical portion 18, in contact with the inner surface of the other steel pipe 10, be formed along its entire length, one on the side surface side thereof, can be inserted slits 20 of the protrusion 16, along its entire length Is formed.
[0023]
In addition, in the example shown in FIG. 2, although the protrusion part 16 of one steel pipe 10 is penetrated in the cylinder part 18 of the other steel pipe 10, the state which connected a pair of steel pipe 10 is shown. Focusing on the steel pipe 10 , a protrusion 16 protrudes from the outer surface of the outer peripheral portion of the steel pipe 10 having a circular cross section, and a cylindrical portion 18 is provided on the inner surface of the outer peripheral surface .
[0024]
In this case, the cylindrical portion 18 is formed with the slit hole 20 so that the protruding portion 16 can be inserted in the axial direction. After the protruding portion 16 is inserted, the protruding portion 16 is detached in the connecting direction. Is disabled.
[0025]
Further, in the case of the present embodiment, an injection tube 22 for the water blocking material 14 is attached to the side of the upper surface side of the cylindrical portion 18. The injection tube 22 has a hollow cylindrical shape and extends in parallel with the cylindrical portion 18.
[0026]
The infusion tube 22 and the cylindrical portion 18 are connected to each other by a communication tube 24. In the case of the present embodiment, a plurality of communication pipes 24 are provided at regular intervals (pitch P) along the longitudinal direction of the tube body 22 or the cylindrical portion 18. The cylindrical portion 18 is provided with a through hole into which the tip of the communication tube 24 is inserted.
[0027]
A check valve 26 is arranged in each communication pipe 24. The check valve 26 allows the water-stopping material 14 to flow from the injection space 28 to be described later to the tube portion 18 side, while the water-stopping material 14 filled and injected into the tube portion 18 is on the injection tube body 22 side. It has a function to prevent it from flowing out.
[0028]
When filling and injecting the water blocking material 14 into the cylindrical portion 18 of the joint portion 12, an injection tube 30 as shown in FIG. 3 is inserted into the injection tube body 22. The injection tube 30 shown in FIG. 3 includes a pair of packers 32, an injection tube main body 34, and an air supply tube 36 that communicates with the packer 32.
[0029]
The packer 32 is a bag-like body that can be expanded and contracted. When compressed air is injected from the air supply pipe 36, the diameter of the packer 32 is increased so as to be in close contact with the inner surface of the injection tube 22, and the compressed air is extracted. Separate from the inner surface of the injection tube 22.
[0030]
When the packer 32 is separated from the inner surface of the injection tube 22, the injection tube 30 can be moved in the longitudinal direction of the tube 22, and the diameter of the packer 32 is expanded so that the inner surface of the injection tube 22 is formed. It can fix to the arbitrary positions in the pipe body 22 by making it closely_contact | adhere.
[0031]
The diameter expansion / contraction means of the packer 32 is not limited to compressed air, and for example, a liquid such as water may be injected and removed to expand or contract the diameter. In the injection pipe main body 34, a plurality of discharge holes 37 for discharging the water blocking material 14 to the outside are formed penetratingly in a section sandwiched between the packers 32.
[0032]
When filling and injecting the water-stopping material 14 into the cylindrical portion 18, first, the main body 34 of the injection pipe 30 is connected to the hopper 38 containing the water-stopping material 14 via the pump 39, and the air supply pipe A compressor 40 is connected to 36.
[0033]
In this state, the injection tube 30 is inserted into the tube body 22, and the water blocking material 14 is filled and injected from the back side of the cylindrical portion 18. In this case, the innermost part of the cylindrical part 18 is closed with an end plate.
[0034]
When the water blocking material 14 is pumped by the pump 39, the packer 32 is set at the position shown in FIG. That is, the pair of packers 32 is sandwiched between one communication pipe 24 and set at equal intervals on both sides thereof, supplied with compressed air, and expanded in diameter at that position. It is closely fixed to the inner surface of the tube body 22.
[0035]
When the packer 32 is fixed at such a position, an injection space 28 defined by a pair of packers 32 is defined in the injection tube 22. In such a state, when the water blocking material 14 is fed into the injection pipe main body 34 via the pump 39, the water blocking material 14 is discharged to the injection space 28 via the discharge hole 37, and then the check is stopped. The valve 26 is opened and injected into the cylindrical portion 18.
[0036]
In this case, in this embodiment, the installation intervals of the communication pipes 24 are equal, and the capacity of the water blocking material 14 filled and injected into the cylindrical portion 18 through one communication pipe 24 is the communication pipe 24. Therefore, it is desirable to fill and inject the water-stopping material 14 having the same volume as the volume calculated in advance through the communication pipes 24.
[0037]
When such a filling and injection method is adopted, if the amount of the water stop material 14 to be delivered is measured via the pump 39, for example, when the amount is small, a cavity is generated in the cylindrical portion 18. It can be predicted that no cavity is generated when the set amount is filled and injected.
[0038]
In addition, since the water stop material 14 employ | adopted by a present Example is highly viscous substances, such as mortar, as mentioned above, when this is filled and inject | poured in the cylinder part 18, it will flow out long in the longitudinal direction of the cylinder part 18. And does not flow over a wide range.
[0039]
Accordingly, the water-stopping material 14 injected into the cylindrical portion 18 through the communication pipe 24 is filled almost equally on both sides of the communication pipe 24 as a center, and is in such a filling state. The relationship between the volume in the cylinder 18 and the injection amount is established.
[0040]
As described above, when a certain amount of the water-stopping material 14 is delivered via the pump 39 and filled into the cylinder portion 18, the supply of the water-stopping material 14 by the pump 39 is stopped, and the packer After extracting the compressed air in 32 and contracting the packer 32, the injection tube 30 is moved in the direction of the arrow in FIG.
[0041]
Then, the same operation as described above is repeated with the packer 32 disposed on both sides of the right communication pipe 24 as a center, thereby injecting the water stop material 14 into the cylindrical portion 18 through the injection space 28. By filling and sequentially repeating such an operation, the water-stopping material 14 is filled and injected over the entire length of the cylindrical portion 18, and the water-stopping material 14 is solidified to ensure water-stopping between the steel pipes 10.
[0042]
In this case, the water-stopping material 14 that has been injected and filled in the cylindrical portion 18 in the previous step receives the pressure of the water-stopping material 14 that is newly injected and filled into the cylindrical portion 18, but the communication pipe 24 Since the check valve 26 is provided, the water stop material 14 is prevented from flowing back to the injection tube 22 side.
[0043]
When the backflow of the water stop material 14 is prevented in this way, the amount of the water stop material 14 filled and injected into the cylindrical portion 18 does not decrease, and the water stop material 14 remains in the tube body 22. This can also be prevented.
[0044]
In the case of the present embodiment, when the water-stopping material 14 is filled and injected over the entire length of the cylindrical portion 18, before the water-stopping material 14 is completely solidified, for example, on the side surface of the cylindrical portion 18. A non-destructive inspection device, for example, an inspection device that detects a cavity by irradiation with a radioisotope is installed, and the presence or absence of a hollow portion that is an unfilled portion of the water-stopping material 14 is detected in the cylindrical portion 18. In the case where the water stop material 14 is found, the injection tube 30 can be inserted into the tube body 22 again, and the water stop material 14 can be filled and injected into the cavity generation location.
[0045]
Such secondary filling and injection of the water-stopping material 14 can be performed by preventing the backflow by the check valve 26 described above and removing the water-stopping material 14 remaining between the packers 32 by pulling out the injection pipe 30. It is possible because it is possible.
[0046]
Now, according to the method for injecting a water-stopping material for a steel pipe joint portion configured as described above, a pipe 22 for injection of the water-stopping material 14 is attached to the side of the tube portion 18 of the steel pipe joint portion 12 to form a cylinder. The portion 18 and the injection tube body 22 communicate with each other via a communication tube 24 provided at a predetermined interval along the longitudinal axis direction, and the diameter and contraction of the injection tube body 22 are expanded and contracted by fluid injection. The injection pipe 30 of the water blocking material 14 provided with a pair of packers 32 is installed, the diameter of each of the communication pipes 24 is increased, and the pair of packers 32 are arranged before and after the pipes 32 so as to be separated by the packers 32. The injection space 28 is separated, and the water blocking material 14 is filled and injected into the cylindrical portion 18 through the injection space 28, so that the worker enters the inside of the steel pipe having a poor working environment and performs the injection work. There is no need.
[0047]
In this case, the water-stopping material 14 forms an injection space 27 partitioned by a packer, and the water-stopping material 14 is filled and injected into the cylindrical portion 18 through the injection space 28. As compared with the case of injecting water, fine injection can be performed, and the construction management can be facilitated. As a result, almost complete water stoppage can be obtained.
[0048]
In addition, although the case where this invention was applied to the steel pipe 10 provided with the joint part 12 comprised by the T-shaped projection part 16 and the square cylinder part 18 was illustrated in the said Example, implementation of this invention is limited to this. However, other joint structures may be used.
[0049]
【The invention's effect】
As described above in detail, according to the method for injecting a water-stopping material for a steel pipe joint portion according to the present invention, work in a poor environment can be eliminated and almost complete water-stopping can be obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a pipe roof construction method to which a method for injecting a water-stopping material for a steel pipe joint according to the present invention is applied.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is an explanatory diagram when filling and injecting a water-stopping material to the joint portion of the steel pipe shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Steel pipe 12 Joint part 14 Water stop material 16 Protrusion part 18 Tube part 20 Slit hole 22 Injection pipe body 24 Communication pipe 26 Check valve 28 Injection space 30 Injection pipe 32 Packer

Claims (5)

While the steel pipes are connected to each other in a lateral direction via a joint provided in the steel pipe , when the plurality of steel pipes are embedded in the ground in a substantially horizontal direction, Injecting the viscous water-stopping material to ensure the water-stopping between the steel pipes,
The joint portion is a protrusion projecting from one outer surface of the adjacent steel pipe ,
Provided on the other inner surface of the adjacent steel pipe, and can be inserted in the axial direction of the protrusion, and after the insertion of the protrusion, a cylindrical portion that cannot be removed in the connecting direction,
A pipe for injection of the highly viscous water-stopping material is attached to the side of the cylindrical portion, and the cylindrical portion and the injection tubular body are communicated with each other at a predetermined interval along the longitudinal axis direction. While installing multiple communication pipes ,
In the pipe for injection, the injection pipe for the high-viscosity water-stopping material provided with a pair of packers that expand and contract by fluid injection,
The diameter of each of the communication pipes is increased in a state where the pair of packers are arranged before and after the communication pipes, and an injection space partitioned by the packers is defined, and the injection tube is inserted into the cylindrical portion via the injection space. Filling and injecting the high-viscosity water- stopping material, a water-stopping material injection method for steel pipe joints. 2. The steel pipe joint part according to claim 1, wherein the high-viscosity water-stopping material has the same installation interval of the communication pipes and injects a certain amount into the injection space according to the volume of the cylinder part. Water-stopping material injection method. A check valve that allows inflow of the water-stopping material from the injection space into the tube portion and prevents the water-stopping material filled in the tube portion from flowing out to the tube side in the communication pipe. The water-stopping material injection method for steel pipe joints according to claim 1 or 2, wherein The said protrusion part is formed in a T-shape, The water-stopping material injection | pouring method of the steel pipe joint part of any one of Claim 1 to 3 characterized by the above-mentioned. 5. The method for injecting a water-stopping material for a steel pipe joint according to claim 4, wherein the cylindrical portion is formed in a square cross section, and a slit hole into which the protrusion can be inserted is formed along the longitudinal axis direction.

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